The Hotcha Trio was a harmonica ensemble from the Netherlands that made many records in the 1950s. It was formed in Rotterdam in the mid-1930s and dissolved in 1970.Vonks vondst: het Hotcha trio fro
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f76ecdee09a7ff442e355eb4e3731f6b66d94388c89062a7bbcdbf0f594d12. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dc57905-7322-4efc-932c-5434ff013db2.json and https://artists.proofprofile.net/proofs/artist/2dc57905-7322-4efc-932c-5434ff013db2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.